电荷补偿剂对Sr_2MgSi_2O_7:Eu^(3+)红色发光粉结构和性能的影响  

Effects of Charge Compensators on Structure and Luminescent Properties of Sr_2MgSi_2O_7:Eu^(3+) Red-light-emitting Phosphors

作　　者：翟永清[1] 游志江[1] 王欣[1] 邢瑞思[1] 吕佳佩[1] 

机构地区：[1]河北大学化学与环境科学学院,河北保定071002

出　　处：《硅酸盐学报》2011年第12期1887-1891,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(20675023)资助项目

摘　　要：采用微波辅助凝胶燃烧法制备Sr2MgSi2O7:Eu3+,R+(R=Li,Na,K)系列红色发光粉,通过X射线粉末衍射、荧光分光光度计等分析表征荧光粉的结构以及发光性能。结果表明:Sr2MgSi2O7:Eu3+,R+(R=Li,Na,K)系列红色发光粉的晶体结构与Sr2MgSi2O7的相同,属四方晶系;加入电荷补偿剂Li+、Na+及K+对Sr2MgSi2O7:Eu3+的激发和发射光谱的峰形、峰位影响较小,在277、395 nm处都有较强的激发峰,分别归属于Eu3+-O2-之间的电荷迁移态和Eu3+的f→f跃迁;发射光谱主要由位于593nm和616nm处两个强发射峰组成,分别归属于Eu3+的5D0→7F1磁偶极跃迁和5D0→7F2电偶极跃迁;电荷补偿剂Li+、Na+及K+的加入,均能明显提高Sr2MgSi2O7:Eu3+的激发与发射峰的强度,最佳摩尔掺量均为8%,其中Li+掺杂效果最为显著,616nm处发射峰强度约为单掺Eu3+样品的2倍。A series of red phosphors Sr2MgSi2O7：Eu3＋,R＋（R=Li,Na,K） were synthesized by gel-combustion method assisted by microwave. Phase structure and luminescence properties of the as-synthesized phosphors were investigated by X-ray diffraction and fluorescence spectrophotometry respectively. Results show that Sr2MgSi2O7 ：Eu3＋ , R ＋ （R = Li, Na, K） red phosphors have the same tetragonal crystal structure as that of Sr2MgSi2O7 . Doping with charge compensators （Li ＋ , Na ＋ , or K ＋ ） has little effect on shape and position of peaks in excitation and emission spectra. All the excitation spectra have two strong peaks at 277 nm and 395 nm, which are ascribed to the charge-transfer state of Eu3＋–O2– and f→f transition of Eu3＋ , respectively. The emission spectra consist of two emis- sion peaks at 593 nm and 616 nm, which are attributed to 5D0 → 7F1 magnetic dipole transition and 5 D0 → 7F2 electric dipole transition of Eu3＋ , respectively. Doping with Li ＋ , Na ＋ , or K ＋ as charge compensators can improve intensity of excitation and emission peaks of Sr2MgSi2O7 ：Eu3＋ . The optimum doping mole fraction is 8%, and Li ＋ result in the most improvement of intensity of the peaks in the excitation and emission spectra; the emission intensity at 616 nm is about 2 times of that of Sr2MgSi2O7 ：Eu3＋ .

关 键 词：焦硅酸盐 红色发光粉 电荷补偿剂 凝胶–燃烧法 微波辅助 

分 类 号：O614.33[理学—无机化学]